WO2006061669A1 - Structural reinforcement element for wooden chairs - Google Patents

Structural reinforcement element for wooden chairs Download PDF

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Publication number
WO2006061669A1
WO2006061669A1 PCT/IB2004/004037 IB2004004037W WO2006061669A1 WO 2006061669 A1 WO2006061669 A1 WO 2006061669A1 IB 2004004037 W IB2004004037 W IB 2004004037W WO 2006061669 A1 WO2006061669 A1 WO 2006061669A1
Authority
WO
WIPO (PCT)
Prior art keywords
cross
chair
reinforcement element
reinforcement
frame
Prior art date
Application number
PCT/IB2004/004037
Other languages
French (fr)
Inventor
Mauro Valveno
Original Assignee
Artelegno Di Mauro Valveno
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Artelegno Di Mauro Valveno filed Critical Artelegno Di Mauro Valveno
Priority to PCT/IB2004/004037 priority Critical patent/WO2006061669A1/en
Priority to EP04801343A priority patent/EP1819257A1/en
Publication of WO2006061669A1 publication Critical patent/WO2006061669A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B96/00—Details of cabinets, racks or shelf units not covered by a single one of groups A47B43/00 - A47B95/00; General details of furniture
    • A47B96/06—Brackets or similar supporting means for cabinets, racks or shelves
    • A47B96/07—Brackets or similar supporting means for cabinets, racks or shelves adjustable in themselves
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B12/00—Jointing of furniture or the like, e.g. hidden from exterior
    • F16B12/44—Leg joints; Corner joints
    • F16B12/46—Non-metal corner connections

Definitions

  • the present industrial utility model relates to a structural reinforcement element made of steel for the frame of a wooden chair and/or armchair.
  • the reinforcement element consists of a steel sheet or plate folded into a C-shape, in which the central part is as long as the internal distance of the seat frame between the front and rear legs and the two wings have folded ends that connect to the two front and rear inner cross-members.
  • the steel reinforcement is applied after assembling the chair and/or armchair having a wooden frame by fixing with suitable fastening means to the inner part of the seat frame.
  • wood is a living material, which is susceptible of dimensional variations and expansions in relation to ambient humidity; these drawbacks compromise preservation of the mechanical characteristics of the frame for a long period.
  • the aim of the present industrial utility model is to solve the drawbacks noted in frames for chairs or armchairs by increasing their mechanical strength, and therefore also their durability, for an equal resisting cross-section in the most highly stressed points.
  • the object is to provide a simple reinforcement that is constituted by a metal sheet or plate folded into a C-shape, which is easy to assemble and is locked to the basic frame, in the inner part, by means of conventional fixing systems (for example self-tapping screws, screws and cylindrical fastening blocks).
  • This element is fixed to the inner lateral cross-member of the seat surface, so that one wing is folded onto the front cross-member of said surface and the other wing is folded onto the rear cross-member, thus reinforcing the regions where the legs are attached.
  • two C-shaped reinforcements are applied in a chair, one on the inner right side and the other on the inner left side.
  • the aim and object of the invention are achieved according to the characteristics of the main claim and/or of any other claim cited in this patent text by providing a reinforcement element made of metallic material (for example steel or other material suitable for the purpose) in sheet or plate form, which is folded into a C-shape and can be applied to the concealed inner part of the frame of the seat surface of chairs or armchairs provided with a wooden frame structure.
  • a reinforcement element made of metallic material (for example steel or other material suitable for the purpose) in sheet or plate form, which is folded into a C-shape and can be applied to the concealed inner part of the frame of the seat surface of chairs or armchairs provided with a wooden frame structure.
  • Said element made of C-shaped folded sheet metal has a central portion that is as long as the internal distance between the front cross-member and the rear cross-member and is as high as, or lower than, the height of the lateral cross-member.
  • the end wings are folded at 90° if the inner frame of the chair is square or rectangular and have a different angle if the frame of the seat surface portion is of the trapezoidal type.
  • Said reinforcement element is fixed in the inner part of the frame of the seat surface, connecting the front cross-member, the lateral cross-member and the rear cross-member. Accordingly, a chair or armchair requires two reinforcement elements: one which is fixed so as to affect the right inner part and another that affects the left inner lateral part.
  • the reinforcement element is provided with holes on the end wings for the passage of the screws, while slots for the passage of self-tapping screws are provided in the central portion.
  • the present invention therefore increases the mechanical strength of the wooden frame proximate to the legs, which are vulnerable regions because they are subjected to higher stresses.
  • the reinforcement element can follow the geometric shapes of the inner frame and in particular can follow, in close contact or not, the lateral cross-member of the structure of the seat surface of the chair.
  • the present invention is particularly useful in the manufacture of stackable and non- stackable chairs and/or armchairs having a wooden frame structure.
  • Figure 1 is a partial perspective view of the frame of the seat surface of a wooden chair, illustrating the two lateral metallic reinforcements;
  • Figure 2 is a plan view of Figure 1;
  • Figure 3 is a partial perspective view of the right side of a frame reinforced with the metallic element
  • Figure 4 is a plan view of a frame of the seat surface with lateral reinforcement elements, illustrating the application of corner screws proximate to the rear legs;
  • Figure 5 is a plan view of a reinforcement element with wings folded at an angle other than 90°, suitable to reinforce the frame of the seat surface of a trapezoidal chair;
  • Figure 6 is a partial perspective view of the right side of a chair frame reinforced with an element and also fixed with corner screws at the rear leg;
  • Figure 7 is a front view of the C-shaped reinforcement element, illustrating the slots in the central portion
  • Figure 8 is a side view of said element, illustrating the screw holes on the end wings;
  • Figure 9 is a plan view of the same C-shaped reinforcement element shown in Figures 7 and 8, with the end wings folded at 90°.
  • the reinforcement element 5 made of metal, preferably steel, is obtained from a sheet or plate and is shaped so as to assume the contour of the inner part of the frame of the seat surface of the stackable or non- stackable chair or armchair.
  • Said element is approximately C-shaped; the central part is as long as the internal distance between the front and rear cross-members 4, along the lateral cross-member 1, and is provided with slots 9 in order to allow its fixing by means of self-tapping screws 8 to said cross- member.
  • Holes 10 are provided on the end wings 13, which are folded at 90° or at different angles, for the passage of screws 7, which fasten onto appropriately provided cylinders 6 inserted in the body of the front and rear cross-members, or an equivalent technical solution.
  • two reinforcement elements are fixed: one on the inner right side, affecting the front cross-member, the right lateral cross- member, and the rear cross-member 4, and one on the left side, affecting the front cross-member, the left lateral cross-member, and the rear cross-member.
  • additional locking screws 11 are used proximate to the fold, so as to insert them at an angle in order to anchor the rear leg 2 and/or the front leg 3 to said element.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)

Abstract

A structural reinforcement element (5) made of steel for the wooden frame of a chair and/or armchair, which consists of a steel sheet or plate folded into a C-shape, in which the central part is as long as the inner distance of the seat frame, between the front and rear legs (2), and in which the two end wings are folded at 90° or at another angle and are connected to the two inner front and rear cross-members (4). The element is fixed laterally to the cross-member (1) by means of screws (8) and the end wings are fixed by means of screws (7) and cylindrical blocks (6) to the front and rear cross-members (4).

Description

STRUCTURAL REINFORCEMENT ELEMENT FOR WOODEN CHAIRS
Field of application
The present industrial utility model relates to a structural reinforcement element made of steel for the frame of a wooden chair and/or armchair. The reinforcement element consists of a steel sheet or plate folded into a C-shape, in which the central part is as long as the internal distance of the seat frame between the front and rear legs and the two wings have folded ends that connect to the two front and rear inner cross-members. The steel reinforcement is applied after assembling the chair and/or armchair having a wooden frame by fixing with suitable fastening means to the inner part of the seat frame.
Background art
In the background art, in the manufacture of chairs with a wooden frame, it has been found that said chairs, if subjected to repeated stresses, fail proximate to the location of the interlocking coupling between the frame of the rear legs and the surface of the seat. This causes limited durability and likewise limited reliability of said chairs.
In order to try to solve this drawback, it has been thought to increase the dimensions of the resisting cross-sections of the material and to apply new kinds of coupling among the various elements that constitute the frame. This, when possible, entails a substantial increase in final price, indeed because thicker solid wood parts are used.
Moreover, wood is a living material, which is susceptible of dimensional variations and expansions in relation to ambient humidity; these drawbacks compromise preservation of the mechanical characteristics of the frame for a long period.
Summary of the model
The aim of the present industrial utility model is to solve the drawbacks noted in frames for chairs or armchairs by increasing their mechanical strength, and therefore also their durability, for an equal resisting cross-section in the most highly stressed points.
The object is to provide a simple reinforcement that is constituted by a metal sheet or plate folded into a C-shape, which is easy to assemble and is locked to the basic frame, in the inner part, by means of conventional fixing systems (for example self-tapping screws, screws and cylindrical fastening blocks). This element is fixed to the inner lateral cross-member of the seat surface, so that one wing is folded onto the front cross-member of said surface and the other wing is folded onto the rear cross-member, thus reinforcing the regions where the legs are attached. Accordingly, two C-shaped reinforcements are applied in a chair, one on the inner right side and the other on the inner left side.
Essence of the model
The aim and object of the invention are achieved according to the characteristics of the main claim and/or of any other claim cited in this patent text by providing a reinforcement element made of metallic material (for example steel or other material suitable for the purpose) in sheet or plate form, which is folded into a C-shape and can be applied to the concealed inner part of the frame of the seat surface of chairs or armchairs provided with a wooden frame structure.
Said element made of C-shaped folded sheet metal has a central portion that is as long as the internal distance between the front cross-member and the rear cross-member and is as high as, or lower than, the height of the lateral cross-member. The end wings are folded at 90° if the inner frame of the chair is square or rectangular and have a different angle if the frame of the seat surface portion is of the trapezoidal type.
Said reinforcement element is fixed in the inner part of the frame of the seat surface, connecting the front cross-member, the lateral cross-member and the rear cross-member. Accordingly, a chair or armchair requires two reinforcement elements: one which is fixed so as to affect the right inner part and another that affects the left inner lateral part.
The reinforcement element is provided with holes on the end wings for the passage of the screws, while slots for the passage of self-tapping screws are provided in the central portion. In order to provide firm and rigid fixing, particularly on the end wings of the metallic reinforcement, it is necessary to prepare the respective fixing regions on the front and rear cross- members, preferably on the concealed lower side, in order to insert suitable metallic hardware within the body of the cross-members.
The present invention therefore increases the mechanical strength of the wooden frame proximate to the legs, which are vulnerable regions because they are subjected to higher stresses.
In another technical solution, in order to further stiffen the connection between the metal reinforcement element and the frame of the seat surface of the chair, it is possible to use self- tapping corner screws, which are inserted at an angle in the bending point, accordingly connecting directly the plate to the leg.
Furthermore, the reinforcement element can follow the geometric shapes of the inner frame and in particular can follow, in close contact or not, the lateral cross-member of the structure of the seat surface of the chair.
The present invention is particularly useful in the manufacture of stackable and non- stackable chairs and/or armchairs having a wooden frame structure.
Description of the drawings
This and other characteristics of the present invention become better apparent, by way of preferred non-limiting example, in the two accompanying drawings, wherein:
Figure 1 is a partial perspective view of the frame of the seat surface of a wooden chair, illustrating the two lateral metallic reinforcements;
Figure 2 is a plan view of Figure 1;
Figure 3 is a partial perspective view of the right side of a frame reinforced with the metallic element;
Figure 4 is a plan view of a frame of the seat surface with lateral reinforcement elements, illustrating the application of corner screws proximate to the rear legs;
Figure 5 is a plan view of a reinforcement element with wings folded at an angle other than 90°, suitable to reinforce the frame of the seat surface of a trapezoidal chair;
Figure 6 is a partial perspective view of the right side of a chair frame reinforced with an element and also fixed with corner screws at the rear leg;
Figure 7 is a front view of the C-shaped reinforcement element, illustrating the slots in the central portion;
Figure 8 is a side view of said element, illustrating the screw holes on the end wings;
Figure 9 is a plan view of the same C-shaped reinforcement element shown in Figures 7 and 8, with the end wings folded at 90°.
As shown in the accompanying drawings, the reinforcement element 5 made of metal, preferably steel, is obtained from a sheet or plate and is shaped so as to assume the contour of the inner part of the frame of the seat surface of the stackable or non- stackable chair or armchair.
Said element is approximately C-shaped; the central part is as long as the internal distance between the front and rear cross-members 4, along the lateral cross-member 1, and is provided with slots 9 in order to allow its fixing by means of self-tapping screws 8 to said cross- member. Holes 10 are provided on the end wings 13, which are folded at 90° or at different angles, for the passage of screws 7, which fasten onto appropriately provided cylinders 6 inserted in the body of the front and rear cross-members, or an equivalent technical solution.
In a chair or armchair with a wooden seat surface structure, two reinforcement elements are fixed: one on the inner right side, affecting the front cross-member, the right lateral cross- member, and the rear cross-member 4, and one on the left side, affecting the front cross-member, the left lateral cross-member, and the rear cross-member.
In chairs in which the frame of the seat surface is rectangular or square, reinforcement elements such as 5 are used, whereas trapezoidal frames use shaped reinforcements 12 with end wings 13 at folding angles other than 90°.
In order to further reinforce the rigid connection between the metallic reinforcement element and the structure of the wood chair, additional locking screws 11 are used proximate to the fold, so as to insert them at an angle in order to anchor the rear leg 2 and/or the front leg 3 to said element.

Claims

1. A structural reinforcement element for wooden chairs, characterized in that it is made of metallic material and is approximately C-shaped, its central part being provided with at least one slot (9) for the passage of screws (8), its end wings being folded at 90° and/or at different angles, with one or more holes (10) for the passage of screws (7), said central part being equal in length to the inner distance of the wooden frame of the seat surface of the chair between the front and rear cross-members (4), and/or being in contact with the inner surface of the lateral cross- member, and being as high as, or lower than, the inner height of the cross-members, the lengths of the wings being mutually identical or different, said reinforcement element mutually connecting, in the internal part of the frame of the wooden chair, the front cross-member, the lateral cross-member and the rear cross-member, affecting respectively the front leg (3) and the rear leg (2) through the lateral cross-member (1) that connects them, two identical reinforcement elements being preferably usable in order to stiffen the wooden frame of the chair or armchair and improve its mechanical strength, said two reinforcement elements being fitted in opposite configurations, one being fitted so as to affect the right lateral inner cross-member (1) and the other being fitted so as to affect the left lateral inner cross-member.
2. The reinforcement element according to claim 1, characterized in that it is suitable to improve the mechanical strength of the frames of stackable and non-stackable chair or armchairs having a fixed or collapsible structure.
3. The reinforcement element according to claim 1, characterized in that it is provided with holes proximate to or in the corner fold of the end wings for the passage of self-tapping screws or other equivalent elements in order to anchor directly to said reinforcement also the front leg (3) and/or rear leg (2) of the chair.
4. The reinforcement element according to claim 1, characterized in that its central part has a variable and adjustable length and is divided into two parts that can be moved and fastened with respect to each other, in order to adapt to the distance between the inner front cross-member and the inner rear cross-member (4).
PCT/IB2004/004037 2004-12-08 2004-12-08 Structural reinforcement element for wooden chairs WO2006061669A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/IB2004/004037 WO2006061669A1 (en) 2004-12-08 2004-12-08 Structural reinforcement element for wooden chairs
EP04801343A EP1819257A1 (en) 2004-12-08 2004-12-08 Structural reinforcement element for wooden chairs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2004/004037 WO2006061669A1 (en) 2004-12-08 2004-12-08 Structural reinforcement element for wooden chairs

Publications (1)

Publication Number Publication Date
WO2006061669A1 true WO2006061669A1 (en) 2006-06-15

Family

ID=34960334

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2004/004037 WO2006061669A1 (en) 2004-12-08 2004-12-08 Structural reinforcement element for wooden chairs

Country Status (2)

Country Link
EP (1) EP1819257A1 (en)
WO (1) WO2006061669A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2309751A1 (en) * 1975-04-29 1976-11-26 Gargiulo Antonio Connecting link for furniture members - has spring hooks holding side plates to centre across corner
US4961236A (en) * 1990-01-02 1990-10-09 Luconi Lanzo E Mattress position adjustment device
US5269484A (en) * 1991-01-07 1993-12-14 Jones Wally W Holder for electronic equipment accessories
US6224128B1 (en) * 1999-06-24 2001-05-01 David R. Mains Adjustable shelf for vehicular camper
FR2850847A1 (en) * 2003-02-07 2004-08-13 Marc Michel Bourrillon Case with self supporting structure for placing computer system, has strong section made of steel tube structure equipped with reinforcements for receiving base, metal sheet bottom and cover of folded metal sheet

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2309751A1 (en) * 1975-04-29 1976-11-26 Gargiulo Antonio Connecting link for furniture members - has spring hooks holding side plates to centre across corner
US4961236A (en) * 1990-01-02 1990-10-09 Luconi Lanzo E Mattress position adjustment device
US5269484A (en) * 1991-01-07 1993-12-14 Jones Wally W Holder for electronic equipment accessories
US6224128B1 (en) * 1999-06-24 2001-05-01 David R. Mains Adjustable shelf for vehicular camper
FR2850847A1 (en) * 2003-02-07 2004-08-13 Marc Michel Bourrillon Case with self supporting structure for placing computer system, has strong section made of steel tube structure equipped with reinforcements for receiving base, metal sheet bottom and cover of folded metal sheet

Also Published As

Publication number Publication date
EP1819257A1 (en) 2007-08-22

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